Foolishly, Completely Falling

"Now that he’s actually gone and done it, there seems to be no way of going back - no rinse and repeat, no ctrl+alt+del, no abort button, no help to be had. He’s fallen into a black hole and he cannot seem to find a way out. The black hole is also known as Tumblr. More specifically, it’s known as Tumblr’s Larry Stylinson tag."

OR: The one where Louis becomes a Larry shipper by accident.